Lo-Fi Games

While creating a new character a strange bug occurred. The picture had changed from full screen to picture in picture, what means the default desktop resolution has been restored, while the game has retained the resolution chosen for it. This is not uncommon for botched engines like Unity. What is unusual is that there was no apparent reason for this. In addition, the game stopped responding to any input. I've really never had that before, with any game.

Does it happen reliably? Or was it a one off issue?

If you can make it happen reliably, posting your logs of just after it happens could be helpful. Those logs reset after launching the game again, so odds are they would not be useful now unless you haven't launched the game again since.